People ar still buying music. But sales are down this year. “Buyers have snatched up 597.4 million albums this year, compared with 669.7 million in the same period in 2001. The 11% drop follows last year’s dip of 2.5%, the first no-growth year since Nielsen SoundScan began tabulating sales data in 1991. After enjoying a decade of climbing sales, retailers were alarmed by the 2001 decrease and hoped the drop was temporary fallout from 9/11 and a weakening economy. Today they’d welcome such a benign stumble over this year’s sizable plunge, which can’t be dismissed as a fluke. The culprit?”